Blow-off valve.



J. V. SCHMID.

BLOW-OFF VALVE.

APPLIoATIoN FILED MAY 29. 190s.

937,096. L i Patented Oct. 19, 1909.

'UNITED STATE-s PArENroFFIoE.

JOHN v. scumm, or PnrLAnELPHrmPENNsYLVANIA, AssreNoE 'ro THE srMPLEX ENGINEERING co., oF PHILADELPHIA, PENNSYLVANIA, A coEPonATIoN or PENN- SYLVANIA.

BLow-orr Specification of Letters Patent.

Patented oet. 19,1909.

- boiler where the sediment and other deleterious materials in the water of a boiler collect in large quantities and if the valve is not properly designed the seat thereof and adjacent parts will soonvbecome so worn as to require the replacing 'of most of the working parts of the valve.

Itis the object of my invention to provide a valve which vwill be free from thel above troubles, one in which it is impossible for the scale and sediment to reach the operating parts, which are suiliciently protected so that they are never in contact with any of the blow-o`fl products.

My object further consists in providing a valve consisting of a reciprocating plun er operating with a smooth bore and provi ed 3th coperating parts which adjust suitable packing members entirely independent of the means for reciprocating the plunger' bu, which, however, operate simultaneously therewith.

It further consists of other novel features of construction, all as will be hereinafter fully set forth.

For the purpose of illustrating my invention, 0I have shown in the laccompanying drawings one forni thereof whichl is at present preferred by me, since the same has been found in practice to give satisfactory and reliable results, although it is to be un-l derstood that the various instrumentalities of which my invention-consists canbe variously arranged and organized' andtthat my invention is not limited to fthe precise arrangement and organization *of these"instru mentalities as herein shown anddescribed".Q

Figure 1 represents a vertical'ps'ection through a valve embodying my. invention. 12 represents a section on line .fn-, 1

imilar numerals of reference indicate 'corresponding parts in the figures. v

Referring to the drawings z--l designates a substantially cylindrical casing having a bore 2 therethrou h and communicating with whichis an in et opening 3 and outlet opening 4, the former of Awhich passes -through a tubular extension 5 of the main casing 1 and has preferably integral therewith laterally extending flanges 6 which serve to attach the casing to a suitable pipe line. The casing 1 is lprovided with` an en-` larged ortion 7 Iin'vorder to provide for a counter ore 8, for-a purpose to be hereinafter described. The enlarged portion 7 of the casing 1 terminates in an outwardly 'extending flange 9 provided for the purpose of receiving a cap plate 10 secured thereto in any suitable-manner, in the present instance by means of the stud bolts 11 spaced at suitablel intervals.

s I12 designates a yoke .formed preferably7 integral with the' late l10 and having a hub 13, screw threaded) to receive a threaded rod 14, on the end of .which is a hand operated wheel 15. The 'yoke 12 is provided with A ribs 16,'thepurpose of which will presently appear. The rod 14 has detachably secured lmeans for which, in the present instance, consists of a plurality of disks 18 and 1 9 spaced apart on the rod 14, one of which 1s adapted to fit -within a recess 2 0 yof theY plunger 17, a slot -21 being provided for the proper positioning of the disk 18 in said recess 20, whereby the rod 14 and the plunger 17 are securely fastened together.

thereto a hollow plunger 17, the securing' 22 designates an angular channel formed j within` the plunger 17 one end4 of which is adapted to communicate with thel outlet 4 and the other end, when lcorrectly positioned, communicates with the inlet 3. -It will thus be seen that if the plunger' 17 is raised suiliciently theinlet 3- Willhave a direct com'- munication with the outlet 4 through 'the channel 22 while if, the plunger is moved suiliciertly within the borecommunication' between the inlet and outlet is entirel cut oii'. It is well known in apparatus o this type which is exposed to the action of scale and the like, that the seat becomes worn, the valve loose and its efficiency very much impaired. In order to prevent wear of this -kind Il provide the counterbore 8 which yforms a seat 23, the same being engaged by suitable packing rings 24, and being maintained in place by a sleeve 25 surrounding the plunger 17 and having an opemng26 111 one side adjacent the inlet 3. It will be clear that this sleeve prevents any sediment' -the plunger is prevented and a straight up and down sliding movement communicated to the plunger.

In the operation of this valve the hand wheel 15 is rotated so that the plunger 17 is raised until the channel 22 comes into direct alinement with the inlet 3, at which time a free access from the boiler `is permitted throughthe outlet 4;. It will be clear that no matter how much dirt, sediment or scale may be discharged through the blow-out it will be impossible for any of the same to come in contact with the operating walls of the plunger 17,'while at the same time the Yannular seat itself is doubly protected by the packing 24; and sleeve v25. When the hand Wheel 15 is turned to close the inlet 3, thus shutting off the blow-oli, it will be seen that when nearly in closed position the flange 29 of the plunger 17 will contact with thel annular ring 28 and force the same down so as to compress the several sets ofl packing, whereby an automatic adjustment of the packing is made possible at each closingof the valve. Especial attention is directed to this feature of adjusting the packing by the same hand Wheel that operates the valve, since by this construction there are no other adjusting means necessary on the valve and the adjusting may be accurately controlled by the same wheel that operates the valve. It is to be noted that the packing adjusting vmeans, as also the means for holding the plunger against rotation, are both refer-ably exterior of the casing, thereby ringing them entirelyA out of contact with the blow ott products. Vhen movin parts are located within the casing, the sediment andthe like in the blow off must necessarily corrode and Cprevent operation of the valve when desire It is well known to those familiar with the conditions under which a blow-oit valve operates, that it is extremely difficult, owing to the severe conditions to which they are subjected, to maintain such a valve any 'length of time free from scale and sediment,

on the seat of the economically and the same operates to make an absolutely tight joint Vwhen closed, and which in open position does not expose any of the working parts to contact with the scale or sediment.

Having thus described my invention, what I claim as new' and desi-re to secure by Letters Patent, is

1. In a device of the character described, a

`casing having inlet and outlet openings, a

plunger in said casing having a channel therethrough, packing surrounding said plunger above and below one of said openings, 'means to operate said plunger, and means on said plunger exterior of the casing to adjust said packing.

2. In a device of the character described, a casing having inlet and outlet openings, a plunger in said casing having a channel therethrough, packing surrounding said plunger above and below one of said openings, lugs on said plunger' exterior of said casing adapted to compress said packing, and means to operate said plunger.

3. In a device of the character described, a casing having an inlet` and outlet opening, a plunger in said casing, annular packing surrounding said plunger above and below one of said openings, means to shift said plunger to establish communication between said in- `let and outlet openings, `and means on said ings, means for moving said plunger, and a device exterior of said casing actuated by said means to adjust said packing.

5 In a device of the character described, a casing'having inlet and outlet openings, a

plunger in said casing having a channel rotation of said plunger, and means to therethrough, packing surrounding said just said packing by the movement of sind plunger above and below one of Said openplunger.

ings, a yoke secured to said casing, a stem I JCI-IN VJSCHMID.

e connected to said plunger and coopera-ting A Witnesses:

with said yoke to partially Withdraw sala ROBERT M. BARR, plunger from said casing'. means to prevent C. D. MCVAY. 

